By Retta Race on SwimSwam
2026 Niigata Prefecture High School Autumn Prefectural Tournament
Friday, September 4th Niigata Prefecture, Japan SCM (25m) ResultsA new World Junior Record was set in the boys’ short course meters 100 breaststroke at the 2026 Niigata Prefecture High School Autumn Prefectural Tournament.
Racing in the final of the event today, September 4th, 17-year-old Yusei Imaizumi fired off a monster lifetime best of 56.35. That got him to the wall miles ahead of the field, with the next-closest competitor clocking a time of 1:03.30.
Imaizumi’s performance sliced .30 off the former World Junior Record of 56.65 fellow Japanese ace Shin Ohashi established at the All Japan Junior Olympic Cup in March of this year.
On-fire Ohashi would go on to also put new WJRs on the books in the SCM 200 breaststroke (2:01.24, March 2026), as well as the LCM 100 breaststroke (58.54, August 2026) and LCM 200 breaststroke (2:06.59, March 2026).
Comparing Imaizumi’s new benchmark against Ohashi’s, the former took the race out swifter from the get-go and then managed to hang on and come within .06 of the latter’s back half.
Yusei Imaizumi‘s New WJR – 56.35 Shin Ohashi‘s Former WJR – 56.65 26.54 26.90 29.81 29.75Imaizumi is a two-time Junior Pan Pacific Championships individual gold medalist, having won both the 100m breast (59.98) and 50m breast (27.55) in Canada this summer.
This performance is on par with a pair of LCM swims put up by Imaizumi’s senior countrymen this week at the Intercollegiate Championships.
Olympic silver medalist Tomoyuki Matsushita became the 4th-best men’s 400m IM performer of all time with a new lifetime best and Asian Record of 4:05.83, while World Championshps silver medalist Tatsuya Murasa posted a new JPN record of 47.83 in the men’s 100m freestyle.
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